I have friends in overalls whose friendship I would not sleep for the favor of the kings of the world.

It always seems impossible until it's done.

Fear is a double-edged weapon: it can force you to do something or prevent you from doing something.

Failure comes only when we forget our ideals and objectives and principles.

These technologies can make life easier, can let us touch people we might not otherwise. You may have a child with a birth defect and be able to get in touch with other parents and support groups, get medical information, the latest experimental drugs. These things can profoundly influence life. I'm not downplaying that.

An ounce of practice is worth more than tons of preaching.

If I were not a physicist, I would probably be a musician. I often think in music. I live my daydreams in music. I see my life in terms of music. 

Nonviolence is the first article of my faith. It is also the last article of my creed.

If you have a particular faith or religion, that is good. But you can survive without it.

To my mind, there is no doubt that this Gandhi age is the dark age of India. It is an age in which people, instead of looking for their ideals in the future, are returning to antiquity.

Sense perceptions can be and often are false and deceptive, however real they may appear to us. Where there is realization outside the senses, it is infallible. It is proved not by extraneous evidence but in the transformed conduct and character of those who have felt the real presence of God within.

We don't know a millionth of one percent about anything.